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Answer:
Convex mirror
Concave mirror
What is the nature of the image formed by a concave mirror if the magnification produced by the mirror is +3 ? Solution : If the magnifiction has a plus sign (+), then the image is virtual and erect. In this case, the magnification has a plus sign (it us +3), therefore , the nature of this image is virtual and erect.
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1 . (a) convex mirror
(b) concave mirror
2 . The positive sign here, indicates that the image is virtual, that is the image is formed on the other side of the mirror. The value '3' indicates that the image formed is enlarged, that is the image is 3 times as big as the object. Thus, the nature of the image is Virtual, erect and enlarged.
3 . For example, hydrogen gas (H2) can react (burn) with oxygen gas (O2) to form water (H20). The chemical equation for this reaction is written as: The '+' is read as 'reacts with' and the arrow '' means 'produces'. The chemical formulas on the left represent the starting substances, called reactants.
4 . The general equation for an endothermic reaction is: Reactants + Energy → Products. In endothermic reactions, the temperature of the products is typically lower than the temperature of the reactants.
5 . To see an enlarged image of our face, we use a concave mirror. This is because when an object is extremely close to a concave mirror, it forms a virtual, erect and enlarged image. Whereas, in a convex mirror, the image formed is virtual, erect and smaller than the object.
6 . When object is placed at infinity then incident light rays are parallel to principal axis and they will converge at focal point of lens. diagram in photo.
7 . Uses of convex lens are in daily life are as follows :
- Convex lens is used in microscopes and magnifying glasses to subject all the light to a specific point.
- Convex lens is used as a camera lens in cameras as they focus light for a clean picture.
- Convex lens is used in the correction of hypermetropia.
